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Night-Flow and leakage analysis
Socrates is
an instrument for analysing night-flows, leakage and legitimate
customer use, in water distribution systems, Socrates uses
patented autocorrelation techniques, plus artefact filtering,
to carry out high accuracy surveys of district meter areas.
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Troubleshooting District
Meter Areas
With its diagnostic precision Socrates probes
deep into night-flows to reveal the lowest baseline
flows, pointing leakage engineers towards real areas
of high leakage. This is very useful on DMAs with
trade users who are using water intermittently.
Determination
of legitimate night-use
When used on smaller
District Meter Areas Socrates shows
baseline leakage with user events clearly superimposed.
This enables the accurate determination of Company
specific legitimate night-use
values.
Realistic estimation of
leakage
Socrates forms
a statistical model over several weeks. On larger
DMAs the baseline leakage is deduced from this
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Socrates measures night-flows accurately
Socrates collects
thousands of data values per night. After removing measurement
system error, the data is autocorrelated to find its micro-period.
This is the shortest period over which values must be averaged
to remove extraneous hydraulic effects, such as oscillations
and surges. This reduces the raw data to, typically, 500
micro-period values and these expose the crucial details
of the night flow.
Daily plot of minimum night-flows. Socrates shows true linimum flow and separates out trade flows. High night flow is due to usage and not leakage.
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